I tried them this week
I found it very hard to determine any changes to my flying speeds, approach and landing with them as compared without them. I have my VG's attached with really good carpet tape, I plan to experiement with them some and see if I can make a more educated conclusion as to keep them or remove them. I made my own VG's out of raw aluminum T stock, took approx 4 hours of my hobby time and $14 for 12 feet, I have 6 feet left over. Size of the VG are 1 inch in lengh, each tab are 3/8" and I made the base concave to better surface for adhearing to the wing. I based my size of the VG's after the BLR VG's on our Cheiftain that I fly. I placed each pair of VG's approx 3 inches apart starting at the wing tip gave me 11 pairs (22 total) for a grand total of 44 VG's.